Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 46)

n b5-26: PI Maximum Boost Time
Associated with the Snooze Function. In cases where the temporary PI Setpoint (intended PI setpoint + PI Setpoint Boost)
cannot be reached within the PI Maximum Boost Time (b5-26), the Setpoint Boost is interrupted and the Drive output is turned
off.
No. Parameter Name Setting Range Default
b5-26 PI Maximum Boost Time 0 to 2600 s 0 s
n b5-27: PI Snooze Feedback Level
The second method of initiating the Snooze Function. The drive output shuts off when the PI feedback level exceeds the PI
Snooze Feedback Level (b5-27).
Normal drive and PI operation return after the PI feedback drops below the PI Snooze Deactivation Level (b5-24). Snooze
activates when both b5-22 and b5-27 conditions are met. There is no time delay for deactivation.
Sets as a percentage of maximum frequency.
No. Parameter Name Setting Range Default
b5-27 PI Snooze Feedback Level 0 to 100% 60%
n b5-28: PI Feedback Function Selection
When b5-28 is set to 1, the square root of the PI feedback is compared to the PI Setpoint to determine appropriate drive output
to properly regulate the system.
This is helpful in cases where the measured feedback is pressure, but the PI loop needs to regulate flow.
No. Parameter Name Setting Range Default
b5-28 PI Feedback Function Selection 0, 1 0
0: Disabled
1: Square Root
n b5-29: PI Square Root Gain
A multiplier applied to the square root of the feedback. If the PI Function is regulating the flow of a closed loop system by
using a pressure feedback, it may be convenient to view the square root of the PI output using monitor U1-37.
No. Parameter Name Setting Range Default
b5-29 PI Square Root Gain 0.00 to 2.00 0.00
n b5-30: PI Feedback Offset
Sets PI feedback Offset as a percentage of maximum frequency.
No. Parameter Name Setting Range Default
b5-30 PI Feedback Offset 0.00 to 100.00% 0.00%
n b5-34: PI Output Lower Limit
Sets the minimum possible PI controller output as a percentage of the maximum output frequency (E1-04). The lower limit is
disabled when set to 0.00%
No. Name Setting Range Default
b5-34 PI Output Lower Limit -100.0 to 100.0% 0.0%
n b5-35: PI Input Limit
Sets the maximum allowed PI input as a percentage of the maximum output frequency (E1-04). Parameter b5-35 acts as a
bipolar limit.
No. Name Setting Range Default
b5-35 PI Input Limit 0 to 1000.0% 1000.0%
1.2 b: Application
46 YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual